How fast does the Grim Reaper walk?

I would urge readers to read this rather brilliant analysis from the latest British Medical Journal (BMJ 2011;343:d7679) regarding the relationship between walking speed and mortality.

This article has implications for exercise prescription for preventative health in the older population; and as far as I am aware represents one of the first studies on it’s kind.
The study concludes that “the Grim Reaper’s preferred walking speed is 0.82 m/s (2 miles (about 3 km) per hour) under working conditions. As none of the men in the study with walking speeds of 1.36 m/s (3 miles (about 5 km) per hour) or greater had contact with Death, this seems to be the Grim Reaper’s most likely maximum speed; for those wishing to avoid their allotted fate, this would be the advised walking speed”.